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mig welding issue

I have been practicing with my new aluminum spool gun and have been haveing a few issues. I am welding 1/8" aluminum with 5356 .030 wire using a millermatic 210. I have it dialed in so that I have a nice spray transfer and the weld is looking nice, once I get going. But the first inch of weld seems to not be hot enough and the weld doesn't melt in very good, once I get going the weld looks nice and then at the end of the weld there seems to be to much heat and the metal melts away. Is this a common problem with mig aluminum on 1/8". Would a bit of preheat on the first inch or so help out for the first part and if I stop for a minute before I reach the end, let it cool some then weld the last bit.

Ahhhhh......aluminum.......I'd say you may need a hair more voltage and a a hair more and a half wire speed....aluminum gets hot.....just practice.....it always takes time to set up a spoolgun....

Originally Posted by Stomper

I have been practicing with my new aluminum spool gun and have been haveing a few issues. I am welding 1/8" aluminum with 5352 .030 wire using a millermatic 210. I have it dialed in so that I have a nice spray transfer and the weld is looking nice, once I get going. But the first inch of weld seems to not be hot enough and the weld doesn't melt in very good, once I get going the weld looks nice and then at the end of the weld there seems to be to much heat and the metal melts away. Is this a common problem with mig aluminum on 1/8". Would a bit of preheat on the first inch or so help out for the first part and if I stop for a minute before I reach the end, let it cool some then weld the last bit.